Interesting. I'm "happy" to report that this doesn't appear to be a bug in the extension ... it's something wonky (not) happening with a cookie the site wants to set the first time a search is performed. (You should be able to re-create the problem after disabling the extension by clearing your comicbookdb.com cookies and re-opening the site.)

I'll send a problem report to Chris with what little info I've gleaned.

As an aside: I realize I have some work to do to get the extension revved up for Firefox 3 compatibility purposes, but the Greasemonkey script version is unaffected. When I get around to it, I also have a handful of new features pending I'll try to roll into the update.